Kbtotter-head eor bzktders



0. S. JOHNSON.

KNOTTER HEAD FOR BINDERS. APPLICATION FILED JUNE 12, 19!].

1 ,3 1 6, 578. Patented Sept. 23, 1919.

INVENTOR 3% g??? BY%JM W ATTORNEY OSCAR s. JOHNSON, or MAKoTI, NORTHDAKOTA.

KNOTTEKHED r012. nin'nnns. r

To all who it Maj concern v v Beit known that I, Oscar: S. JOHNSON, a

citizen of] the United States, residing at Makoti, in'the county of Wardand State of North Dakota, have invented certain new and usefulImprovements in Knotter-Head's for Binders, of which; the following isgaspecification.

This invention relates to agricultural im plements, and moreparticularly to knotter heads for binders.

The main object of the invention is to provide simple and efficientmeans whereby wear and lost motionin]theltyihgmechanism of the knotterhead of a binder may be compensated for and the tying thereof accuratelyeffected at the proper time.

After the tying mechanism for binders has been used to some extent, itsometimes misses and oftentimes forms a knot in one end while the otherend of the securing. device slips through. This is owing to the factthat the knotter jaw wears a groove in the knotter jaw cam therebycausing lost motion and preventing the knotter jaw from lookingat theproper place, such as is necessary to cause the accurate tying of abundle. It is to overcome this objection and insure the accurateoperation of the tying mechanism that this device is designed.

With the foregoing and other objects in view, which will appear as thedescription proceeds, the invention resides in the combination andarrangement of parts and in the details of construction hereinafterdescribed and claimed, it being understood that changes in the preciseembodiment of the invention herein disclosed may be made within thescope of what is claimed without departing from the spirit of theinvention.

In the accompanying drawings Figure 1 represents a side elevation withparts broken out of a knotter head-casting and breastplate equipped withthis invention, Fig. 2 shows a detail perspective view of the springemployed forholding the knotter jaw cam in operative engagement with theknotter jaw,

Fig. 3 is a plan view of the knotter jaw cam detached; and

Fig. 4 is a detail plan view.

In the embodiment illustrated, a knotter head casting 1 is shown havinga breastplate 2 of ordinary construction secured thereto and a knotterjaw cam 3 also car- Specification of Letters Patent.

I Patented Sept. 23, 1919.

Application meetin 12, 1917. seria' no. 1 14.295.

ried thereby, said cam being constructed in the form shown in Fig. 1 andsecured to the casting 1 by a fastening element here shown in the formof a screw 4:. This jaw cam 3 taperstoward one end and has outstandingcain flanges 5, an aperture 6' being provided at its rear endfor thepassage of the seouringscrew 4.

A knotter of ordinary constructionnot shown provided with the usual jawoperates inconnection with the cam 3 to effect the tying operation.

The-continuous operation of the device causes the knotter jaw to wear agroove in the cam 3, and to overcome the objectionable lost motionoccasioned thereby, I have provided .a plate spring 7 which is securedat one end to the breast-p-late 2, preferably by a bolt 8, one end ofsaid spring being here shown bent at right angles as indicated at 11 inFigs. 1 and 2, and which is passed through an opening 2 in thebreast-plate to hold the spring against turning. This spring 7 ispreferably made in the form of a compound curve, and the free endthereof bears normally against the lower edge of cam 3 and operates toforce it upwardly thereby presenting a new wearing surface for contactwith the knotter jaw. Means for adjusting the tension of this spring ishere shown in the form of a set screw 9 which passes through thebreast-plate 2 and engages the lower face of spring 7 and is shownclearly in Fig. 1. Thus it will be observed that the cam 3 may have itsposition varied according to the tension of spring 7 and that thistension is regulated by said set screw although obviously other meansmay be employed if found desirable.

The breast-plate 2 is here shown secured to the knotter head casting 1by means of a bolt 11 held in operative engagement therewith by locknuts 12.

It is well known in devices of this character that the knotter mustrevolve once around with the twine in order to tie a knot, and in sodoing, it is necessary that the knotter jaw cam 3 be roperly adjusted toeffect the tying operation, and this turning of the knotter in time willwear the groove above referred to, causin lost motion, which results inthe knotter aw looking at the wrong place.

The spring 7 which is herein employed for overcoming lost motion betweenthe parts, is made of steel and of a suitable thickness to preventbreakage and by disposing it as herein shown and? described; it

is entirely out of the way of the other parts havlnga lateral projectionon its lower edge of the knotter head. In order to attach this camadjusting means it is only necessary to drillitavo holes inthebreast-plate 2; one f'or the bolt 8 which connects spring. 7 to said.breastplate and one for the set screw 9 which accomplishes theadjustment of the tension of said, springand the oblong open h1g2 for,the passage of the hooked end or 11 of: the spring.

Fronithe foregoing description, taken in connection with theaccompanying drawings,,

the advantages of: the construction; and, of the method of'operationwillv be readily ap- P QJiBIItBl/OK those skilled 1 in. the art to whichthe invention appertains and while I; have.

described. the principle of operation. of. the invention together withthe devicewhich: I: now. consider to, be. the best, embodiment thereof,I desire vto have; it 'understoo d, that the device-shown ismerelyillustrative and the scope of the claimed invention.

I claim 7 The combination of a knotter jaw cam and a breast-plate havingan opening there- 3 in; of a flat spring meta]. strip bent in the formof a compound curve having a'right angularly disposed arm at one endpassed through the opening in the breast-plate to hold the. spring.against lateral movement, a bolt seeuringsaid end to said breast-plate,the other end of said plate bearing flatly against said'lateralprojection on said cam, and a bolt adjustably :mounted in saidbreastrplate and engaging the lower: face of said spring to force thefree end thereof into yielding engagement with said cam.

In testimony whereof I aifix my signature in presence of two witnesses.

I OSCAR, S; JOHNSON. Witnesses:

'ENoerr Swanson, E.O.-LERBERG.

Copies 01! this patentimay be obtained for five cents each,by'addressing the Commissioner o1 Patents,

Washington, D. 63." p

